CVE-2002-0741

psyBNC 2.3 - Denial of Service via Long PASS Command

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 2 public exploits for CVE-2002-0741. PoCs published by Lunar Fault, DVDMAN.

AI-analyzed exploit summary This exploit targets a denial-of-service (DoS) vulnerability in psyBNC <= 2.3 by sending an oversized password, causing excessive CPU usage and connection denial. It includes functionality to test for vulnerability and force the attack without prior checks.

Description

psyBNC 2.3 allows remote attackers to cause a denial of service (CPU consumption and resource exhaustion) by sending a PASS command with a long password argument and quickly killing the connection, which is not properly terminated by psyBNC.

Exploits (2)

exploitdb WORKING POC VERIFIED
by Lunar Fault · cdosmultiple
https://www.exploit-db.com/exploits/383

This exploit targets a denial-of-service (DoS) vulnerability in psyBNC <= 2.3 by sending an oversized password, causing excessive CPU usage and connection denial. It includes functionality to test for vulnerability and force the attack without prior checks.

Classification
Working Poc 100%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: psyBNC <= 2.3
No auth needed
Prerequisites: Network access to the target psyBNC server
devstral-2 · analyzed Feb 16, 2026 Full analysis →
exploitdb WORKING POC VERIFIED
by DVDMAN · perldosunix
https://www.exploit-db.com/exploits/21409

This exploit targets a denial-of-service (DoS) vulnerability in PsyBNC 2.3 by sending an excessively long password (10,000 'A' characters) during the IRC authentication process, causing the server to consume excessive resources and potentially crash.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: PsyBNC 2.3
No auth needed
Prerequisites: Network access to the target PsyBNC server · PsyBNC server running version 2.3
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (4)

Core 4
Core References
Exploit, Patch, Vendor Advisory vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/4570
Patch, Vendor Advisory vdb-entry x_refsource_xf
http://www.iss.net/security_center/static/8912.php
Third Party Advisory mailing-list x_refsource_bugtraq
http://archives.neohapsis.com/archives/bugtraq/2002-04/0322.html
Third Party Advisory, VDB Entry mailing-list x_refsource_bugtraq
http://online.securityfocus.com/archive/1/269131

Scores

EPSS 0.0799
EPSS Percentile 94.0%

Details

Status published
Products (1)
psychoid/psybnc 2.3
Published Aug 12, 2002
Tracked Since Feb 18, 2026